Enter the weight you squatted and the number of reps completed to calculate your Squat One-Rep Max (1RM). Choose your preferred unit (lbs or kg) and get back your estimated maximum squat weight for a single rep, plus a full repetition percentage breakdown showing training loads from 1 to 10 reps.
Estimated 1RM
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90% of 1RM (2–3 reps)
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85% of 1RM (4–5 reps)
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80% of 1RM (6–7 reps)
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75% of 1RM (8 reps)
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70% of 1RM (10–12 reps)
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Your one-rep max (1RM) is the maximum weight you can squat for a single complete repetition with proper form. It is the gold standard benchmark for lower-body strength in powerlifting and general strength training. Knowing your squat 1RM helps you set training loads, track progress, and compare your strength over time.
This calculator uses the Epley formula: 1RM = Weight × (1 + Reps / 30). It is one of the most widely used and validated formulas for estimating one-rep max from submaximal sets. The result is an estimate — actual performance can vary based on fatigue, technique, and individual factors.
The estimate is most accurate when calculated from sets of 1–5 reps performed close to failure. As rep counts increase above 10, the formula becomes less precise because muscular endurance starts to play a larger role than pure strength. For the best accuracy, use a weight you can only lift 3–5 times.
Not necessarily, especially if you are a beginner. The calculated 1RM is an estimate used for programming purposes, not a mandate to load the bar and max out. Always warm up thoroughly, use a spotter, and consult a qualified fitness professional before attempting true maximal lifts.
Your 1RM is used to calculate training percentages. For example, hypertrophy work is typically done at 65–80% of 1RM, strength work at 80–90%, and maximal strength at 90–100%. The table below the calculator shows estimated weights at each percentage so you can plan your workouts accordingly.
No. Each exercise has its own one-rep max because different muscle groups and movement patterns are involved. Your squat 1RM reflects your lower-body strength and cannot be directly compared to or used in place of your bench press or deadlift max.
Most strength programs suggest retesting or recalculating your 1RM every 4–8 weeks as you progress through a training block. You can also update your estimate after any heavy working set where you push close to failure, rather than performing an all-out max attempt every time.
The calculation works the same regardless of unit — the formula is purely mathematical. Just make sure you enter the weight in the unit you selected (lbs or kg), and all output values will be displayed in that same unit.